FT232R Future Technology Devices Intl Ltd., FT232R Datasheet - Page 26

• Manufacturer Part Number: FT232R
• Manufacturer: Future Technology Devices Intl Ltd.

9. LED Interface
Any of the 5 CBUS I/O pins can be configured to drive an LED. The FT232R has 3 options for driving an LED - these
are TXLED#, RXLED#, and TX&RXLED#.
Figure 17 -Dual LED Configuration
Figure 17 illustrates the configuration where one pin is used to indicate transmission of data (TXLED#) and another
is used to indicate receiving data (RXLED#). When data is being transmitted or received the respective pins will drive
from tri-state to low in order to provide indication on the LEDs of data transfer. A digital one-shot time is used so that
even a small percentage of data transfer is visible to the end user.
Figure 18 -Single LED Configuration
In figure 18 the TX&RXLED CBUS option is used. This option will cause the pin to drive a single LED when data is
being transmitted or received by the device.
FT232R USB UART I.C. Datasheet Version 1.02
FT232R
CBUS[0...4]
CBUS[0...4]
FT232R
CBUS[0...4]
TXLED#
RXLED#
TX&RXLED#
TX
LED
VCCIO
VCCIO
270R
270R
© Future Technology Devices International Ltd. 2005
270R
RX